Nuclear power-- even it the form of fission-- offers the greatest potential for humanity than any other form which is not related to fossil fuels.
Its greatest vulnerabilities lie in waste disposal and accidents. When the accidents happen, they are devastating. The surprise is that there haven't been more accidents since 1945.
On the bright side, nuclear power is also a proven technology which has stood the test of time. Let's remember the number of ships which use nuclear reactors for their power: not just submarines from several nations and American aircraft carriers, but also icebreakers used first by the USSR and then Russia. It's a wonder that environmental harm from these nuclear-powered vessels is nearly minimal compared to that for land-based reactors.